Doubt means a tendency to hesitate, a lack of confidence in oneself and in others, and indecisiveness with everything. This is because people lack guiding principles, goals, and direction, and lack the moral standards needed to guide their behavior. On the other hand, we shouldn't associate cautiousness with doubt. Being cautious means we aspire to do things better and get along well with other people by making preparations and doing research and investigations. Once we've gained a better understanding of a task, we'll encounter fewer difficulties when carrying it out and have better prospects for success.
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